基于微分几何的微网Z源逆变器并网控制  

Research on the Z-Source Inverter Grid-Connected Control of Micro-Grid System Based on Differential Geometry

作　　者：陈艳[1] 周林[1] 雷建[1] 甘元兴[2] 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400030 [2]重庆市电力公司北碚供电局,重庆400700

出　　处：《电工技术学报》2012年第1期17-23,共7页Transactions of China Electrotechnical Society

基　　金：输配电装备及系统安全与新技术国家重点实验室自主研究项目(2007DA10512709211);中央高校基本科研业务费资助项目(CDJXS10151151)

摘　　要：针对应用于微网系统中的Z源逆变器及其并网控制研究,以光伏系统为例,根据Z源变换器本身具有的非线性特性,建立Z源逆变器直流链及逆变侧的仿射非线性模型,利用微分几何基本工具,构造恰当的坐标变换和预反馈,将原非线性系统精确线性化,然后对该系统进行线性最优控制器设计。该逆变器集最大功率点跟踪、升降压和并网发电等功能于一体。仿真及实验表明:当光伏电池在输入条件发生变化时,本文控制方法能够使Z源逆变器直流链快速稳定无超调地跟踪最大功率点,逆变侧输出的三相电压能够实现快速平稳过渡并改善并网电流畸变。For the Z-source inverter used in the distributed generation system and its grid-connected control,the paper takes the photovoltaic system as the example.According to the nonlinear characteristic of Z-source inverter,the affine model of Z-source inverter DC-link and AC side are created.Based on the differential geometry,the proper coordinate transformation and pre-feedback are constructed,and the original nonlinear system is exact linearized,then designed linear optimal controller for the system.The inverter integrates three functions including maximum power point tracking（MPPT）,step-up/down DC-side voltage and output grid-connected.The simulation and experiment are performed to validate the strategies： when input condition of the photovoltaic array changes,this method has better performance than PI control.

关 键 词：微网 微分几何 Z源逆变器 并网 光伏系统 

分 类 号：TM464[电气工程—电器]